I understand this is a somewhat old post, but are you still able to flash that board using the SDKManager? I’m running into a similar issue trying to flash a xavier nx running on Seeed Studio’s J202 carrier board, but getting a repeated “CPU Bootloader is not running…” from the script. However, I have not been able to have any success using the SDKManager GUI either, instead getting a repeated
INFO: Flash Jetson Linux - flash: Waiting for target to boot-up…
If you are using the same carrier, what options/parameters did you select when flashing it?